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Merge sanja.is.com.ua:/home/bell/mysql/mysql-4.1

Browse Source 
into sanja.is.com.ua:/home/bell/mysql/work-row-4.1


mysql-test/r/subselect.result:
  Auto merged
mysql-test/t/subselect.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/sql_class.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_yacc.yy:
  Auto merged
This commit is contained in:
unknown 2002-12-31 12:48:00 +02:00
commit a83a0d4b32
13 changed files with 851 additions and 313 deletions
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105
mysql-test/r/subselect.result
View File

@ -52,6 +52,54 @@ a
SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NOT NULL;
a
1
SELECT (SELECT 1,2,3) = ROW(1,2,3);
(SELECT 1,2,3) = ROW(1,2,3)
1
SELECT (SELECT 1,2,3) = ROW(1,2,1);
(SELECT 1,2,3) = ROW(1,2,1)
0
SELECT (SELECT 1,2,3) < ROW(1,2,1);
(SELECT 1,2,3) < ROW(1,2,1)
0
SELECT (SELECT 1,2,3) > ROW(1,2,1);
(SELECT 1,2,3) > ROW(1,2,1)
1
SELECT (SELECT 1,2,3) = ROW(1,2,NULL);
(SELECT 1,2,3) = ROW(1,2,NULL)
NULL
SELECT ROW(1,2,3) = (SELECT 1,2,3);
ROW(1,2,3) = (SELECT 1,2,3)
1
SELECT ROW(1,2,3) = (SELECT 1,2,1);
ROW(1,2,3) = (SELECT 1,2,1)
0
SELECT ROW(1,2,3) < (SELECT 1,2,1);
ROW(1,2,3) < (SELECT 1,2,1)
0
SELECT ROW(1,2,3) > (SELECT 1,2,1);
ROW(1,2,3) > (SELECT 1,2,1)
1
SELECT ROW(1,2,3) = (SELECT 1,2,NULL);
ROW(1,2,3) = (SELECT 1,2,NULL)
NULL
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'a');
(SELECT 1.5,2,'a') = ROW(1.5,2,'a')
1
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'b');
(SELECT 1.5,2,'a') = ROW(1.5,2,'b')
0
SELECT (SELECT 1.5,2,'a') = ROW('b',2,'b');
(SELECT 1.5,2,'a') = ROW('b',2,'b')
0
SELECT (SELECT 'b',2,'a') = ROW(1.5,2,'a');
(SELECT 'b',2,'a') = ROW(1.5,2,'a')
0
SELECT (SELECT 1.5,2,'a') = ROW(1.5,'c','a');
(SELECT 1.5,2,'a') = ROW(1.5,'c','a')
0
SELECT (SELECT 1.5,'c','a') = ROW(1.5,2,'a');
(SELECT 1.5,'c','a') = ROW(1.5,2,'a')
0
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8;
create table t1 (a int);
create table t2 (a int, b int);
@ -586,7 +634,7 @@ EXPLAIN SELECT * FROM t WHERE id IN (SELECT 1 UNION SELECT 3);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t index NULL id 5 NULL 2 Using where; Using index
2 DEPENDENT SUBSELECT NULL NULL NULL NULL NULL NULL NULL No tables used
3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
SELECT * FROM t WHERE id IN (SELECT 5 UNION SELECT 3);
id
SELECT * FROM t WHERE id IN (SELECT 5 UNION SELECT 2);
@ -602,7 +650,7 @@ CREATE TABLE t1 (id int(11) default NULL, KEY id (id)) TYPE=MyISAM CHARSET=latin
INSERT INTO t1 values (1),(1);
UPDATE t SET id=(SELECT * FROM t1);
Subselect returns more than 1 record
drop table t;
drop table t, t1;
create table t (a int);
insert into t values (1),(2),(3);
select 1 IN (SELECT * from t);
@ -711,3 +759,56 @@ This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
select 10.5 IN (SELECT * from t LIMIT 1 UNION SELECT 1.5);
This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
drop table t;
create table t1 (a int, b int, c varchar(10));
create table t2 (a int);
insert into t1 values (1,2,'a'),(2,3,'b'),(3,4,'c');
insert into t2 values (1),(2),(NULL);
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),(select c from t1 where a=t2.a) from t2;
a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a') (select c from t1 where a=t2.a)
1 1 a
2 0 b
NULL NULL NULL
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b'),(select c from t1 where a=t2.a) from t2;
a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b') (select c from t1 where a=t2.a)
1 0 a
2 1 b
NULL NULL NULL
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c'),(select c from t1 where a=t2.a) from t2;
a (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c') (select c from t1 where a=t2.a)
1 0 a
2 0 b
NULL NULL NULL
drop table t1,t2;
drop table if exists t;
create table t (a int, b real, c varchar(10));
insert into t values (1, 1, 'a'), (2,2,'b'), (NULL, 2, 'b');
select ROW(1, 1, 'a') IN (select a,b,c from t);
ROW(1, 1, 'a') IN (select a,b,c from t)
1
select ROW(1, 2, 'a') IN (select a,b,c from t);
ROW(1, 2, 'a') IN (select a,b,c from t)
NULL
select ROW(1, 1, 'a') IN (select b,a,c from t);
ROW(1, 1, 'a') IN (select b,a,c from t)
1
select ROW(1, 1, 'a') IN (select a,b,c from t where a is not null);
ROW(1, 1, 'a') IN (select a,b,c from t where a is not null)
1
select ROW(1, 2, 'a') IN (select a,b,c from t where a is not null);
ROW(1, 2, 'a') IN (select a,b,c from t where a is not null)
0
select ROW(1, 1, 'a') IN (select b,a,c from t where a is not null);
ROW(1, 1, 'a') IN (select b,a,c from t where a is not null)
1
select ROW(1, 1, 'a') IN (select a,b,c from t where c='b' or c='a');
ROW(1, 1, 'a') IN (select a,b,c from t where c='b' or c='a')
1
select ROW(1, 2, 'a') IN (select a,b,c from t where c='b' or c='a');
ROW(1, 2, 'a') IN (select a,b,c from t where c='b' or c='a')
NULL
select ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a');
ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a')
1
select ROW(1, 1, 'a') IN (select b,a,c from t limit 2);
This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
drop table if exists t;

43
mysql-test/t/subselect.test
View File

@ -26,6 +26,22 @@ select (SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE(1));
SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE((SELECT 1));
SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NULL;
SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NOT NULL;
SELECT (SELECT 1,2,3) = ROW(1,2,3);
SELECT (SELECT 1,2,3) = ROW(1,2,1);
SELECT (SELECT 1,2,3) < ROW(1,2,1);
SELECT (SELECT 1,2,3) > ROW(1,2,1);
SELECT (SELECT 1,2,3) = ROW(1,2,NULL);
SELECT ROW(1,2,3) = (SELECT 1,2,3);
SELECT ROW(1,2,3) = (SELECT 1,2,1);
SELECT ROW(1,2,3) < (SELECT 1,2,1);
SELECT ROW(1,2,3) > (SELECT 1,2,1);
SELECT ROW(1,2,3) = (SELECT 1,2,NULL);
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'a');
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'b');
SELECT (SELECT 1.5,2,'a') = ROW('b',2,'b');
SELECT (SELECT 'b',2,'a') = ROW(1.5,2,'a');
SELECT (SELECT 1.5,2,'a') = ROW(1.5,'c','a');
SELECT (SELECT 1.5,'c','a') = ROW(1.5,2,'a');
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8;
create table t1 (a int);
@ -363,7 +379,7 @@ CREATE TABLE t1 (id int(11) default NULL, KEY id (id)) TYPE=MyISAM CHARSET=latin
INSERT INTO t1 values (1),(1);
-- error 1240
UPDATE t SET id=(SELECT * FROM t1);
drop table t;
drop table t, t1;
#NULL test
@ -416,4 +432,27 @@ create table t (a float);
select 10.5 IN (SELECT * from t LIMIT 1);
-- error 1235
select 10.5 IN (SELECT * from t LIMIT 1 UNION SELECT 1.5);
drop table t;
drop table t;create table t1 (a int, b int, c varchar(10));
create table t2 (a int);
insert into t1 values (1,2,'a'),(2,3,'b'),(3,4,'c');
insert into t2 values (1),(2),(NULL);
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),(select c from t1 where a=t2.a) from t2;
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b'),(select c from t1 where a=t2.a) from t2;
select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c'),(select c from t1 where a=t2.a) from t2;
drop table t1,t2;
drop table if exists t;
create table t (a int, b real, c varchar(10));
insert into t values (1, 1, 'a'), (2,2,'b'), (NULL, 2, 'b');
select ROW(1, 1, 'a') IN (select a,b,c from t);
select ROW(1, 2, 'a') IN (select a,b,c from t);
select ROW(1, 1, 'a') IN (select b,a,c from t);
select ROW(1, 1, 'a') IN (select a,b,c from t where a is not null);
select ROW(1, 2, 'a') IN (select a,b,c from t where a is not null);
select ROW(1, 1, 'a') IN (select b,a,c from t where a is not null);
select ROW(1, 1, 'a') IN (select a,b,c from t where c='b' or c='a');
select ROW(1, 2, 'a') IN (select a,b,c from t where c='b' or c='a');
select ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a');
-- error 1235
select ROW(1, 1, 'a') IN (select b,a,c from t limit 2);
drop table if exists t;

194
sql/item.cc
View File

@ -47,11 +47,6 @@ Item::Item():
loop_id= 0;
}
Item_ref_in_optimizer::Item_ref_in_optimizer(Item_in_optimizer *master,
char *table_name_par,
char *field_name_par):
Item_ref(master->args, table_name_par, field_name_par), owner(master) {}
bool Item::check_loop(uint id)
{
@ -437,20 +432,6 @@ String *Item_copy_string::val_str(String *str)
return &str_value;
}
double Item_ref_in_optimizer::val()
{
return owner->get_cache();
}
longlong Item_ref_in_optimizer::val_int()
{
return owner->get_cache_int();
}
String* Item_ref_in_optimizer::val_str(String* s)
{
return owner->get_cache_str(s);
}
/*
Functions to convert item to field (for send_fields)
*/
@ -464,18 +445,6 @@ bool Item::fix_fields(THD *thd,
return 0;
}
bool Item_outer_select_context_saver::fix_fields(THD *thd,
struct st_table_list *list,
Item ** ref)
{
DBUG_ENTER("Item_outer_select_context_saver::fix_fields");
bool res= item->fix_fields(thd,
0, // do not show current subselect fields
&item);
*ref= item;
DBUG_RETURN(res);
}
bool Item_asterisk_remover::fix_fields(THD *thd,
struct st_table_list *list,
Item ** ref)
@ -529,6 +498,27 @@ bool Item_asterisk_remover::fix_fields(THD *thd,
DBUG_RETURN(res);
}
bool Item_ref_on_list_position::fix_fields(THD *thd,
struct st_table_list *tables,
Item ** reference)
{
ref= 0;
List_iterator<Item> li(list);
Item *item;
uint i= 0;
for (; (item= li++) && i < pos; i++);
if (i == pos)
{
ref= li.ref();
return Item_ref_null_helper::fix_fields(thd, tables, reference);
}
else
{
my_error(ER_CARDINALITY_COL, MYF(0), pos);
return 1;
}
}
double Item_ref_null_helper::val()
{
double tmp= (*ref)->val_result();
@ -1219,6 +1209,148 @@ bool field_is_equal_to_item(Field *field,Item *item)
return result == field->val_real();
}
Item_cache* Item_cache::get_cache(Item_result type)
{
switch (type)
{
case INT_RESULT:
return new Item_cache_int();
case REAL_RESULT:
return new Item_cache_real();
case STRING_RESULT:
return new Item_cache_str();
case ROW_RESULT:
return new Item_cache_row();
default:
// should never be in real life
DBUG_ASSERT(0);
return 0;
}
}
void Item_cache_str::store(Item *item)
{
str_value.set(buffer, sizeof(buffer), item->charset());
value= item->str_result(&str_value);
if ((null_value= item->null_value))
value= 0;
else if (value != &str_value)
{
/*
We copy string value to avoid changing value if 'item' is table field
in queries like following (where t1.c is varchar):
select a,
(select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),
(select c from t1 where a=t2.a)
from t2;
*/
str_value.copy(*value);
value= &str_value;
}
}
double Item_cache_str::val()
{
if (value)
return my_strntod(value->charset(), value->ptr(),
value->length(), (char**)0);
else
return (double)0;
}
longlong Item_cache_str::val_int()
{
if (value)
return my_strntoll(value->charset(), value->ptr(),
value->length(), (char**) 0, 10);
else
return (longlong)0;
}
bool Item_cache_row::allocate(uint num)
{
n= num;
THD *thd= current_thd;
if (!(values= (Item_cache **) thd->calloc(sizeof(Item_cache *)*n)))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
thd->fatal_error= 1;
return 1;
}
return 0;
}
bool Item_cache_row::setup(Item * item)
{
if (!values && allocate(item->cols()))
return 1;
for(uint i= 0; i < n; i++)
{
if (!(values[i]= Item_cache::get_cache(item->el(i)->result_type())))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
current_thd->fatal_error= 1;
return 1;
}
values[i]->setup(item->el(i));
}
return 0;
}
void Item_cache_row::store(Item * item)
{
null_value= 0;
item->bring_value();
for(uint i= 0; i < n; i++)
{
values[i]->store(item->el(i));
null_value|= values[i]->null_value;
}
}
void Item_cache_row::illegal_method_call(const char *method)
{
DBUG_ENTER("Item_cache_row::illegal_method_call");
DBUG_PRINT("error", ("!!! %s method was called for row item", method));
DBUG_ASSERT(0);
my_error(ER_CARDINALITY_COL, MYF(0), 1);
DBUG_VOID_RETURN;
}
bool Item_cache_row::check_cols(uint c)
{
if (c != n)
{
my_error(ER_CARDINALITY_COL, MYF(0), c);
return 1;
}
return 0;
}
bool Item_cache_row::null_inside()
{
for (uint i= 0; i < n; i++)
{
if (values[i]->cols() > 1)
{
if (values[i]->null_inside())
return 1;
}
else
{
values[i]->val_int();
if (values[i]->null_value)
return 1;
}
}
return 0;
}
void Item_cache_row::bring_value()
{
for (uint i= 0; i < n; i++)
values[i]->bring_value();
return;
}
/*****************************************************************************
** Instantiate templates

233
sql/item.h
View File

@ -31,12 +31,12 @@ public:
static void *operator new(size_t size) {return (void*) sql_alloc((uint) size); }
static void operator delete(void *ptr,size_t size) {} /*lint -e715 */
enum Type {FIELD_ITEM,FUNC_ITEM,SUM_FUNC_ITEM,STRING_ITEM,
INT_ITEM,REAL_ITEM,NULL_ITEM,VARBIN_ITEM,
COPY_STR_ITEM,FIELD_AVG_ITEM, DEFAULT_ITEM,
PROC_ITEM,COND_ITEM,REF_ITEM,FIELD_STD_ITEM,
FIELD_VARIANCE_ITEM,CONST_ITEM,
SUBSELECT_ITEM, ROW_ITEM};
enum Type {FIELD_ITEM, FUNC_ITEM, SUM_FUNC_ITEM, STRING_ITEM,
INT_ITEM, REAL_ITEM, NULL_ITEM, VARBIN_ITEM,
COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_ITEM,
PROC_ITEM,COND_ITEM, REF_ITEM, FIELD_STD_ITEM,
FIELD_VARIANCE_ITEM, CONST_ITEM,
SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM};
enum cond_result { COND_UNDEF,COND_OK,COND_TRUE,COND_FALSE };
String str_value; /* used to store value */
@ -103,64 +103,12 @@ public:
virtual Item** addr(uint i) { return 0; }
virtual bool check_cols(uint c);
// It is not row => null inside is impossible
virtual bool null_inside() { return 0; };
virtual bool null_inside() { return 0; }
// used in row subselects to get value of elements
virtual void bring_value() {}
};
/*
Wrapper base class
*/
class Item_wrapper :public Item
{
protected:
Item *item;
public:
/*
Following methods should not be used, because fix_fields exclude this
item (it assign '*ref' with field 'item' in derived classes)
*/
enum Type type() const { return item->type(); }
enum_field_types field_type() const { return item->field_type(); }
double val() { return item->val(); }
longlong val_int() { return item->val_int(); }
String* val_str(String* s) { return item->val_str(s); }
bool check_cols(uint col) { return item->check_cols(col); }
bool eq(const Item *item, bool binary_cmp) const
{ return item->eq(item, binary_cmp); }
bool is_null()
{
item->val_int();
return item->null_value;
}
bool get_date(TIME *ltime, bool fuzzydate)
{
return (null_value=item->get_date(ltime, fuzzydate));
}
bool send(Protocol *prot, String *tmp) { return item->send(prot, tmp); }
int save_in_field(Field *field, bool no_conversions)
{
return item->save_in_field(field, no_conversions);
}
void save_org_in_field(Field *field) { item->save_org_in_field(field); }
enum Item_result result_type () const { return item->result_type(); }
table_map used_tables() const { return item->used_tables(); }
};
/*
Save context of name resolution for Item, used in subselect transformer.
*/
class Item_outer_select_context_saver :public Item_wrapper
{
public:
Item_outer_select_context_saver(Item *it)
{
item= it;
}
bool fix_fields(THD *, struct st_table_list *, Item ** ref);
};
class st_select_lex;
class Item_ident :public Item
{
@ -381,7 +329,8 @@ public:
name=(char*) str_value.ptr();
decimals=NOT_FIXED_DEC;
}
Item_string(const char *name_par,const char *str,uint length,CHARSET_INFO *cs)
Item_string(const char *name_par, const char *str, uint length,
CHARSET_INFO *cs)
{
str_value.set(str,length,cs);
max_length=length;
@ -392,11 +341,13 @@ public:
enum Type type() const { return STRING_ITEM; }
double val()
{
return my_strntod(str_value.charset(),str_value.ptr(),str_value.length(),(char**)NULL);
return my_strntod(str_value.charset(), str_value.ptr(),
str_value.length(), (char**) 0);
}
longlong val_int()
{
return my_strntoll(str_value.charset(),str_value.ptr(),str_value.length(),(char**) 0,10);
return my_strntoll(str_value.charset(), str_value.ptr(),
str_value.length(), (char**) 0, 10);
}
String *val_str(String*) { return (String*) &str_value; }
int save_in_field(Field *field, bool no_conversions);
@ -550,7 +501,7 @@ protected:
Item_in_subselect* owner;
public:
Item_ref_null_helper(Item_in_subselect* master, Item **item,
char *table_name_par,char *field_name_par):
char *table_name_par, char *field_name_par):
Item_ref(item, table_name_par, field_name_par), owner(master) {}
double val();
longlong val_int();
@ -558,6 +509,24 @@ public:
bool get_date(TIME *ltime, bool fuzzydate);
};
/*
Used to find item in list of select items after '*' items processing.
*/
class Item_ref_on_list_position: public Item_ref_null_helper
{
protected:
List<Item> &list;
uint pos;
public:
Item_ref_on_list_position(Item_in_subselect* master,
List<Item> &li, uint num,
char *table_name, char *field_name):
Item_ref_null_helper(master, 0, table_name, field_name),
list(li), pos(num) {}
bool fix_fields(THD *, struct st_table_list *, Item ** ref);
};
/*
To resolve '*' field moved to condition
and register NULL values
@ -574,24 +543,6 @@ public:
bool fix_fields(THD *, struct st_table_list *, Item ** ref);
};
class Item_in_optimizer;
class Item_ref_in_optimizer: public Item_ref
{
protected:
Item_in_optimizer* owner;
public:
Item_ref_in_optimizer(Item_in_optimizer* master,
char *table_name_par,char *field_name_par);
double val();
longlong val_int();
String* val_str(String* s);
bool fix_fields(THD *, struct st_table_list *, Item ** ref)
{
fixed= 1;
return 0;
}
};
/*
The following class is used to optimize comparing of date columns
We need to save the original item, to be able to set the field to the
@ -706,6 +657,122 @@ public:
bool cmp(void);
};
class Item_cache: public Item
{
public:
virtual bool allocate(uint i) { return 0; };
virtual bool setup(Item *) { return 0; };
virtual void store(Item *)= 0;
void set_len_n_dec(uint32 max_len, uint8 dec)
{
max_length= max_len;
decimals= dec;
}
enum Type type() const { return CACHE_ITEM; }
static Item_cache* get_cache(Item_result type);
};
class Item_cache_int: public Item_cache
{
longlong value;
public:
Item_cache_int() { fixed= 1; null_value= 1; }
void store(Item *item)
{
value= item->val_int_result();
null_value= item->null_value;
}
double val() { return (double) value; }
longlong val_int() { return value; }
String* val_str(String *str) { str->set(value, thd_charset()); return str; }
enum Item_result result_type() const { return INT_RESULT; }
};
class Item_cache_real: public Item_cache
{
double value;
public:
Item_cache_real() { fixed= 1; null_value= 1; }
void store(Item *item)
{
value= item->val_result();
null_value= item->null_value;
}
double val() { return value; }
longlong val_int() { return (longlong) (value+(value > 0 ? 0.5 : -0.5)); }
String* val_str(String *str)
{
str->set(value, decimals, thd_charset());
return str;
}
enum Item_result result_type() const { return REAL_RESULT; }
};
class Item_cache_str: public Item_cache
{
char buffer[80];
String *value;
public:
Item_cache_str() { fixed= 1; null_value= 1; }
void store(Item *item);
double val();
longlong val_int();
String* val_str(String *) { return value; }
enum Item_result result_type() const { return STRING_RESULT; }
CHARSET_INFO *charset() const { return value->charset(); };
};
class Item_cache_row: public Item_cache
{
Item_cache **values;
uint n;
public:
Item_cache_row(): values(0), n(2) { fixed= 1; null_value= 1; }
/*
'allocate' used only in row transformer, to preallocate space for row
cache.
*/
bool allocate(uint num);
/*
'setup' is needed only by row => it not called by simple row subselect
(only by IN subselect (in subselect optimizer))
*/
bool setup(Item *item);
void store(Item *item);
void illegal_method_call(const char *);
void make_field(Send_field *)
{
illegal_method_call((const char*)"make_field");
};
double val()
{
illegal_method_call((const char*)"val");
return 0;
};
longlong val_int()
{
illegal_method_call((const char*)"val_int");
return 0;
};
String *val_str(String *)
{
illegal_method_call((const char*)"val_str");
return 0;
};
enum Item_result result_type() const { return ROW_RESULT; }
uint cols() { return n; }
Item* el(uint i) { return values[i]; }
Item** addr(uint i) { return (Item **) (values + i); }
bool check_cols(uint c);
bool null_inside();
void bring_value();
};
extern Item_buff *new_Item_buff(Item *item);
extern Item_result item_cmp_type(Item_result a,Item_result b);
extern Item *resolve_const_item(Item *item,Item *cmp_item);

100
sql/item_cmpfunc.cc
View File

@ -247,6 +247,8 @@ int Arg_comparator::compare_e_int()
int Arg_comparator::compare_row()
{
int res= 0;
(*a)->bring_value();
(*b)->bring_value();
uint n= (*a)->cols();
for (uint i= 0; i<n; i++)
{
@ -261,6 +263,8 @@ int Arg_comparator::compare_row()
int Arg_comparator::compare_e_row()
{
int res= 0;
(*a)->bring_value();
(*b)->bring_value();
uint n= (*a)->cols();
for (uint i= 0; i<n; i++)
{
@ -270,13 +274,54 @@ int Arg_comparator::compare_e_row()
return 1;
}
bool Item_in_optimizer::preallocate_row()
{
if ((cache= Item_cache::get_cache(ROW_RESULT)))
return 0;
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
current_thd->fatal_error= 1;
return 1;
}
bool Item_in_optimizer::fix_fields(THD *thd, struct st_table_list *tables,
Item ** ref)
{
if (args[0]->fix_fields(thd, tables, args))
return 1;
if (args[0]->maybe_null)
maybe_null=1;
if (args[0]->binary())
set_charset(my_charset_bin);
with_sum_func= args[0]->with_sum_func;
used_tables_cache= args[0]->used_tables();
const_item_cache= args[0]->const_item();
if (!cache && !(cache= Item_cache::get_cache(args[0]->result_type())))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
thd->fatal_error= 1;
return 1;
}
cache->setup(args[0]);
if (args[1]->fix_fields(thd, tables, args))
return 1;
Item_in_subselect * sub= (Item_in_subselect *)args[1];
if (args[0]->cols() != sub->engine->cols())
{
my_error(ER_CARDINALITY_COL, MYF(0), args[0]->cols());
return 1;
}
if (args[1]->maybe_null)
maybe_null=1;
with_sum_func= with_sum_func || args[1]->with_sum_func;
used_tables_cache|= args[1]->used_tables();
const_item_cache&= args[1]->const_item();
return 0;
}
longlong Item_in_optimizer::val_int()
{
int_cache_ok= 1;
flt_cache_ok= 0;
str_cache_ok= 0;
int_cache= args[0]->val_int_result();
if (args[0]->null_value)
cache->store(args[0]);
if (cache->null_value)
{
null_value= 1;
return 0;
@ -286,44 +331,10 @@ longlong Item_in_optimizer::val_int()
return tmp;
}
longlong Item_in_optimizer::get_cache_int()
bool Item_in_optimizer::is_null()
{
if (!int_cache_ok)
{
int_cache_ok= 1;
flt_cache_ok= 0;
str_cache_ok= 0;
int_cache= args[0]->val_int_result();
null_value= args[0]->null_value;
}
return int_cache;
}
double Item_in_optimizer::get_cache()
{
if (!flt_cache_ok)
{
flt_cache_ok= 1;
int_cache_ok= 0;
str_cache_ok= 0;
flt_cache= args[0]->val_result();
null_value= args[0]->null_value;
}
return flt_cache;
}
String *Item_in_optimizer::get_cache_str(String *s)
{
if (!str_cache_ok)
{
str_cache_ok= 1;
int_cache_ok= 0;
flt_cache_ok= 0;
str_value.set(buffer, sizeof(buffer), s->charset());
str_cache= args[0]->str_result(&str_value);
null_value= args[0]->null_value;
}
return str_cache;
cache->store(args[0]);
return (null_value= (cache->null_value || args[1]->is_null()));
}
longlong Item_func_eq::val_int()
@ -1217,8 +1228,9 @@ void cmp_item_row::store_value(Item *item)
{
THD *thd= current_thd;
n= item->cols();
if ((comparators= (cmp_item **) thd->alloc(sizeof(cmp_item *)*n)))
if ((comparators= (cmp_item **) thd->calloc(sizeof(cmp_item *)*n)))
{
item->bring_value();
item->null_value= 0;
for (uint i=0; i < n; i++)
if ((comparators[i]= cmp_item::get_comparator(item->el(i))))
@ -1252,6 +1264,7 @@ void cmp_item_row::store_value_by_template(cmp_item *t, Item *item)
n= tmpl->n;
if ((comparators= (cmp_item **) sql_alloc(sizeof(cmp_item *)*n)))
{
item->bring_value();
item->null_value= 0;
for (uint i=0; i < n; i++)
if ((comparators[i]= tmpl->comparators[i]->make_same()))
@ -1284,6 +1297,7 @@ int cmp_item_row::cmp(Item *arg)
return 1;
}
bool was_null= 0;
arg->bring_value();
for (uint i=0; i < n; i++)
if (comparators[i]->cmp(arg->el(i)))
{

24
sql/item_cmpfunc.h
View File

@ -85,25 +85,21 @@ public:
void fix_length_and_dec() { decimals=0; max_length=1; }
};
class Item_cache;
class Item_in_optimizer: public Item_bool_func
{
protected:
char buffer[80];
longlong int_cache;
double flt_cache;
String *str_cache;
bool int_cache_ok, flt_cache_ok, str_cache_ok;
Item_cache *cache;
public:
Item_in_optimizer(Item *a,Item *b):
Item_bool_func(a,b), int_cache_ok(0), flt_cache_ok(0), str_cache_ok(0) {}
bool is_null() { return test(args[0]->is_null() || args[1]->is_null()); }
Item_in_optimizer(Item *a, Item_in_subselect *b):
Item_bool_func(a, (Item *)b), cache(0) {}
// used by row in transformer
bool preallocate_row();
bool fix_fields(THD *, struct st_table_list *, Item **);
bool is_null();
longlong val_int();
double get_cache();
longlong get_cache_int();
String *get_cache_str(String *s);
friend class Item_ref_in_optimizer;
Item_cache **get_cache() { return &cache; }
};
class Item_bool_func2 :public Item_int_func

9
sql/item_row.cc
View File

@ -41,7 +41,7 @@ void Item_row::illegal_method_call(const char *method)
DBUG_ENTER("Item_row::illegal_method_call");
DBUG_PRINT("error", ("!!! %s method was called for row item", method));
DBUG_ASSERT(0);
my_error(ER_CARDINALITY_COL, MYF(0), arg_count);
my_error(ER_CARDINALITY_COL, MYF(0), 1);
DBUG_VOID_RETURN;
}
@ -100,3 +100,10 @@ bool Item_row::null_inside()
}
return 0;
}
void Item_row::bring_value()
{
for (uint i= 0; i < arg_count; i++)
items[i]->bring_value();
return;
}

1
sql/item_row.h
View File

@ -70,4 +70,5 @@ public:
Item** addr(uint i) { return items + i; }
bool check_cols(uint c);
bool null_inside();
void bring_value();
};

327
sql/item_subselect.cc
View File

@ -51,7 +51,7 @@ void Item_subselect::init(THD *thd, st_select_lex *select_lex,
DBUG_ENTER("Item_subselect::init");
DBUG_PRINT("subs", ("select_lex 0x%xl", (ulong) select_lex));
select_transformer(select_lex);
select_transformer(select_lex->master_unit());
if (select_lex->next_select())
engine= new subselect_union_engine(thd, select_lex->master_unit(), result,
this);
@ -67,7 +67,7 @@ Item_subselect::~Item_subselect()
delete engine;
}
void Item_subselect::select_transformer(st_select_lex *select_lex)
void Item_subselect::select_transformer(st_select_lex_unit *unit)
{
DBUG_ENTER("Item_subselect::select_transformer");
DBUG_VOID_RETURN;
@ -112,9 +112,14 @@ bool Item_subselect::check_loop(uint id)
DBUG_RETURN(engine->check_loop(id));
}
Item::Type Item_subselect::type() const
{
return SUBSELECT_ITEM;
}
void Item_subselect::fix_length_and_dec()
{
engine->fix_length_and_dec();
engine->fix_length_and_dec(0);
}
inline table_map Item_subselect::used_tables() const
@ -122,56 +127,132 @@ inline table_map Item_subselect::used_tables() const
return (table_map) engine->depended() ? 1L : 0L;
}
Item_singleval_subselect::Item_singleval_subselect(THD *thd,
Item_singlerow_subselect::Item_singlerow_subselect(THD *thd,
st_select_lex *select_lex):
Item_subselect()
Item_subselect(), value(0)
{
DBUG_ENTER("Item_singleval_subselect::Item_singleval_subselect");
init(thd, select_lex, new select_singleval_subselect(this));
DBUG_ENTER("Item_singlerow_subselect::Item_singlerow_subselect");
init(thd, select_lex, new select_singlerow_subselect(this));
max_columns= 1;
maybe_null= 1;
max_columns= UINT_MAX;
DBUG_VOID_RETURN;
}
void Item_singleval_subselect::fix_length_and_dec()
void Item_singlerow_subselect::reset()
{
engine->fix_length_and_dec();
res_type= engine->type();
null_value= 1;
if (value)
value->null_value= 1;
}
Item::Type Item_subselect::type() const
void Item_singlerow_subselect::store(uint i, Item *item)
{
return SUBSELECT_ITEM;
row[i]->store(item);
}
double Item_singleval_subselect::val ()
enum Item_result Item_singlerow_subselect::result_type() const
{
if (engine->exec())
return engine->type();
}
void Item_singlerow_subselect::fix_length_and_dec()
{
if ((max_columns= engine->cols()) == 1)
{
engine->fix_length_and_dec(row= &value);
if (!(value= Item_cache::get_cache(engine->type())))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
current_thd->fatal_error= 1;
return;
}
}
else
{
THD *thd= current_thd;
if (!(row= (Item_cache**)thd->alloc(sizeof(Item_cache*)*max_columns)))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
thd->fatal_error= 1;
return;
}
engine->fix_length_and_dec(row);
value= *row;
}
maybe_null= engine->may_be_null();
}
uint Item_singlerow_subselect::cols()
{
return engine->cols();
}
bool Item_singlerow_subselect::check_cols(uint c)
{
if (c != engine->cols())
{
my_error(ER_CARDINALITY_COL, MYF(0), c);
return 1;
}
return 0;
}
bool Item_singlerow_subselect::null_inside()
{
for (uint i= 0; i < max_columns ; i++)
{
if (row[i]->null_value)
return 1;
}
return 0;
}
void Item_singlerow_subselect::bring_value()
{
engine->exec();
}
double Item_singlerow_subselect::val ()
{
if (!engine->exec() && !value->null_value)
{
null_value= 0;
return value->val();
}
else
{
reset();
return 0;
}
return real_value;
}
longlong Item_singleval_subselect::val_int ()
longlong Item_singlerow_subselect::val_int ()
{
if (engine->exec())
if (!engine->exec() && !value->null_value)
{
null_value= 0;
return value->val_int();
}
else
{
reset();
return 0;
}
return int_value;
}
String *Item_singleval_subselect::val_str (String *str)
String *Item_singlerow_subselect::val_str (String *str)
{
if (engine->exec() || null_value)
if (!engine->exec() && !value->null_value)
{
null_value= 0;
return value->val_str(str);
}
else
{
reset();
return 0;
}
return &string_value;
}
Item_exists_subselect::Item_exists_subselect(THD *thd,
@ -213,7 +294,7 @@ Item_allany_subselect::Item_allany_subselect(THD *thd, Item * left_exp,
left_expr= left_exp;
func= f;
init(thd, select_lex, new select_exists_subselect(this));
max_columns= UINT_MAX;
max_columns= 1;
reset();
// We need only 1 row to determinate existence
select_lex->master_unit()->global_parameters->select_limit= 1;
@ -223,8 +304,9 @@ Item_allany_subselect::Item_allany_subselect(THD *thd, Item * left_exp,
void Item_exists_subselect::fix_length_and_dec()
{
decimals=0;
decimals= 0;
max_length= 1;
max_columns= engine->cols();
}
double Item_exists_subselect::val ()
@ -313,13 +395,12 @@ Item_allany_subselect::Item_allany_subselect(Item_allany_subselect *item):
func= item->func;
}
void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
void Item_in_subselect::single_value_transformer(st_select_lex_unit *unit,
Item *left_expr,
compare_func_creator func)
{
DBUG_ENTER("Item_in_subselect::single_value_transformer");
if (select_lex->master_unit()->global_parameters->select_limit !=
HA_POS_ERROR)
if (unit->global_parameters->select_limit != HA_POS_ERROR)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0),
"LIMIT & IN/ALL/ANY/SOME subquery");
@ -336,19 +417,20 @@ void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
As far as Item_ref_in_optimizer do not substitude itself on fix_fields
we can use same item for all selects.
*/
Item *expr= new Item_ref_in_optimizer(optimizer, (char *)"<no matter>",
(char*)"<left expr>");
select_lex->master_unit()->dependent= 1;
for (SELECT_LEX * sl= select_lex; sl; sl= sl->next_select())
Item *expr= new Item_ref((Item**)optimizer->get_cache(),
(char *)"<no matter>",
(char*)"<left expr>");
unit->dependent= 1;
for (SELECT_LEX * sl= unit->first_select(); sl; sl= sl->next_select())
{
if (select_lex->select_limit != HA_POS_ERROR)
if (sl->select_limit != HA_POS_ERROR)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0),
"LIMIT & IN/ALL/ANY/SOME subquery");
DBUG_VOID_RETURN;
}
select_lex->dependent= 1;
sl->dependent= 1;
Item *item;
if (sl->item_list.elements > 1)
{
@ -373,7 +455,7 @@ void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
sl->having= item;
else
if (sl->where)
sl->where= new Item_cond_and(sl->having, item);
sl->where= new Item_cond_and(sl->where, item);
else
sl->where= item;
}
@ -399,7 +481,7 @@ void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
my_error(ER_NO_TABLES_USED, MYF(0));
DBUG_VOID_RETURN;
}
if (select_lex->next_select())
if (unit->first_select()->next_select())
{
/*
It is in union => we should perform it.
@ -431,15 +513,87 @@ void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
DBUG_VOID_RETURN;
}
void Item_in_subselect::select_transformer(st_select_lex *select_lex)
void Item_in_subselect::row_value_transformer(st_select_lex_unit *unit,
Item *left_expr)
{
single_value_transformer(select_lex, left_expr,
&Item_bool_func2::eq_creator);
DBUG_ENTER("Item_in_subselect::row_value_transformer");
if (unit->global_parameters->select_limit !=
HA_POS_ERROR)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0),
"LIMIT & IN/ALL/ANY/SOME subquery");
DBUG_VOID_RETURN;
}
Item_in_optimizer *optimizer;
substitution= optimizer= new Item_in_optimizer(left_expr, this);
if (!optimizer)
{
current_thd->fatal_error= 1;
DBUG_VOID_RETURN;
}
unit->dependent= 1;
uint n= left_expr->cols();
if (optimizer->preallocate_row() || (*optimizer->get_cache())->allocate(n))
DBUG_VOID_RETURN;
for (SELECT_LEX * sl= unit->first_select(); sl; sl= sl->next_select())
{
if (sl->select_limit != HA_POS_ERROR)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0),
"LIMIT & IN/ALL/ANY/SOME subquery");
DBUG_VOID_RETURN;
}
sl->dependent= 1;
Item *item= 0;
List_iterator_fast<Item> li(sl->item_list);
for (uint i= 0; i < n; i++)
{
Item *func=
new Item_ref_on_list_position(this, sl->item_list, i,
(char *) "<no matter>",
(char *) "<list ref>");
func=
Item_bool_func2::eq_creator(new Item_ref((*optimizer->get_cache())->
addr(i),
(char *)"<no matter>",
(char *)"<left expr>"),
func);
if (!item)
item= func;
else
item= new Item_cond_and(item, func);
}
if (sl->having || sl->with_sum_func || sl->group_list.first ||
!sl->table_list.elements)
if (sl->having)
sl->having= new Item_cond_and(sl->having, item);
else
sl->having= item;
else
if (sl->where)
sl->where= new Item_cond_and(sl->where, item);
else
sl->where= item;
}
DBUG_VOID_RETURN;
}
void Item_allany_subselect::select_transformer(st_select_lex *select_lex)
void Item_in_subselect::select_transformer(st_select_lex_unit *unit)
{
single_value_transformer(select_lex, left_expr, func);
if (left_expr->cols() == 1)
single_value_transformer(unit, left_expr,
&Item_bool_func2::eq_creator);
else
row_value_transformer(unit, left_expr);
}
void Item_allany_subselect::select_transformer(st_select_lex_unit *unit)
{
single_value_transformer(unit, left_expr, func);
}
subselect_single_select_engine::subselect_single_select_engine(THD *thd,
@ -509,31 +663,90 @@ int subselect_union_engine::prepare()
return unit->prepare(thd, result);
}
void subselect_single_select_engine::fix_length_and_dec()
static Item_result set_row(SELECT_LEX *select_lex, Item * item,
Item_cache **row, bool *maybe_null)
{
Item_result res_type= STRING_RESULT;
Item *sel_item;
List_iterator_fast<Item> li(select_lex->item_list);
Item *sel_item= li++;
item->max_length= sel_item->max_length;
res_type= sel_item->result_type();
item->decimals= sel_item->decimals;
for (uint i= 0; (sel_item= li++); i++)
{
item->max_length= sel_item->max_length;
res_type= sel_item->result_type();
item->decimals= sel_item->decimals;
*maybe_null= sel_item->maybe_null;
if (row)
{
if (!(row[i]= Item_cache::get_cache(res_type)))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
current_thd->fatal_error= 1;
return STRING_RESULT; // we should return something
}
row[i]->set_len_n_dec(sel_item->max_length, sel_item->decimals);
}
}
if (select_lex->item_list.elements > 1)
res_type= ROW_RESULT;
return res_type;
}
void subselect_union_engine::fix_length_and_dec()
void subselect_single_select_engine::fix_length_and_dec(Item_cache **row)
{
uint32 mlen= 0, len;
Item *sel_item= 0;
for (SELECT_LEX *sl= unit->first_select(); sl; sl= sl->next_select())
DBUG_ASSERT(row || select_lex->item_list.elements==1);
res_type= set_row(select_lex, item, row, &maybe_null);
if (cols() != 1)
maybe_null= 0;
}
void subselect_union_engine::fix_length_and_dec(Item_cache **row)
{
DBUG_ASSERT(row || unit->first_select()->item_list.elements==1);
if (unit->first_select()->item_list.elements == 1)
{
List_iterator_fast<Item> li(sl->item_list);
Item *s_item= li++;
if ((len= s_item->max_length))
mlen= len;
if (!sel_item)
sel_item= s_item;
uint32 mlen= 0, len;
Item *sel_item= 0;
for (SELECT_LEX *sl= unit->first_select(); sl; sl= sl->next_select())
{
List_iterator_fast<Item> li(sl->item_list);
Item *s_item= li++;
if ((len= s_item->max_length) > mlen)
mlen= len;
if (!sel_item)
sel_item= s_item;
maybe_null!= s_item->maybe_null;
}
item->max_length= mlen;
res_type= sel_item->result_type();
item->decimals= sel_item->decimals;
if (row)
{
if (!(row[0]= Item_cache::get_cache(res_type)))
{
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
current_thd->fatal_error= 1;
return;
}
row[0]->set_len_n_dec(mlen, sel_item->decimals);
}
}
else
{
SELECT_LEX *sl= unit->first_select();
bool fake= 0;
res_type= set_row(sl, item, row, &fake);
for(sl= sl->next_select(); sl; sl->next_select())
{
List_iterator_fast<Item> li(sl->item_list);
Item *sel_item;
for (uint i= 0; (sel_item= li++); i++)
{
if (sel_item->max_length > row[i]->max_length)
row[i]->max_length= sel_item->max_length;
}
}
}
item->max_length= mlen;
res_type= sel_item->result_type();
item->decimals= sel_item->decimals;
}
int subselect_single_select_engine::exec()

77
sql/item_subselect.h
View File

@ -71,7 +71,7 @@ public:
{
null_value= 1;
}
virtual void select_transformer(st_select_lex *select_lex);
virtual void select_transformer(st_select_lex_unit *unit);
bool assigned() { return value_assigned; }
void assigned(bool a) { value_assigned= a; }
enum Type type() const;
@ -86,51 +86,42 @@ public:
bool check_loop(uint id);
friend class select_subselect;
friend class Item_in_optimizer;
};
/* single value subselect */
class Item_singleval_subselect :public Item_subselect
class Item_cache;
class Item_singlerow_subselect :public Item_subselect
{
protected:
longlong int_value; /* Here stored integer value of this item */
double real_value; /* Here stored real value of this item */
/*
Here stored string value of this item.
(str_value used only as temporary buffer, because it can be changed
by Item::save_field)
*/
String string_value;
enum Item_result res_type; /* type of results */
Item_cache *value, **row;
public:
Item_singleval_subselect(THD *thd, st_select_lex *select_lex);
Item_singleval_subselect(Item_singleval_subselect *item):
Item_singlerow_subselect(THD *thd, st_select_lex *select_lex);
Item_singlerow_subselect(Item_singlerow_subselect *item):
Item_subselect(item)
{
int_value= item->int_value;
real_value= item->real_value;
string_value.set(item->string_value, 0, item->string_value.length());
value= item->value;
max_length= item->max_length;
decimals= item->decimals;
res_type= item->res_type;
}
virtual void reset()
{
null_value= 1;
int_value= 0;
real_value= 0;
max_length= 4;
res_type= STRING_RESULT;
}
double val ();
void reset();
void store(uint i, Item* item);
double val();
longlong val_int ();
String *val_str (String *);
Item *new_item() { return new Item_singleval_subselect(this); }
enum Item_result result_type() const { return res_type; }
Item *new_item() { return new Item_singlerow_subselect(this); }
enum Item_result result_type() const;
void fix_length_and_dec();
friend class select_singleval_subselect;
uint cols();
Item* el(uint i) { return (Item*)row[i]; }
Item** addr(uint i) { return (Item**)row + i; }
bool check_cols(uint c);
bool null_inside();
void bring_value();
friend class select_singlerow_subselect;
};
/* exists subselect */
@ -149,7 +140,7 @@ public:
}
Item_exists_subselect(): Item_subselect() {}
virtual void reset()
void reset()
{
value= 0;
}
@ -181,9 +172,10 @@ public:
null_value= 0;
was_null= 0;
}
virtual void select_transformer(st_select_lex *select_lex);
void single_value_transformer(st_select_lex *select_lex,
virtual void select_transformer(st_select_lex_unit *unit);
void single_value_transformer(st_select_lex_unit *unit,
Item *left_expr, compare_func_creator func);
void row_value_transformer(st_select_lex_unit *unit, Item *left_expr);
longlong val_int();
double val();
String *val_str(String*);
@ -202,22 +194,18 @@ public:
Item_allany_subselect(THD *thd, Item * left_expr, compare_func_creator f,
st_select_lex *select_lex);
Item_allany_subselect(Item_allany_subselect *item);
virtual void select_transformer(st_select_lex *select_lex);
virtual void select_transformer(st_select_lex_unit *unit);
};
class subselect_engine
class subselect_engine: public Sql_alloc
{
protected:
select_subselect *result; /* results storage class */
THD *thd; /* pointer to current THD */
Item_subselect *item; /* item, that use this engine */
enum Item_result res_type; /* type of results */
bool maybe_null; /* may be null (first item in select) */
public:
static void *operator new(size_t size)
{
return (void*) sql_alloc((uint) size);
}
static void operator delete(void *ptr, size_t size) {}
subselect_engine(THD *thd, Item_subselect *si, select_subselect *res)
{
@ -225,16 +213,19 @@ public:
item= si;
this->thd= thd;
res_type= STRING_RESULT;
maybe_null= 0;
}
virtual ~subselect_engine() {}; // to satisfy compiler
virtual int prepare()= 0;
virtual void fix_length_and_dec()= 0;
virtual void fix_length_and_dec(Item_cache** row)= 0;
virtual int exec()= 0;
virtual uint cols()= 0; /* return number of columnss in select */
virtual bool depended()= 0; /* depended from outer select */
enum Item_result type() { return res_type; }
virtual bool check_loop(uint id)= 0;
virtual void exclude()= 0;
bool may_be_null() { return maybe_null; };
};
class subselect_single_select_engine: public subselect_engine
@ -249,7 +240,7 @@ public:
select_subselect *result,
Item_subselect *item);
int prepare();
void fix_length_and_dec();
void fix_length_and_dec(Item_cache** row);
int exec();
uint cols();
bool depended();
@ -266,7 +257,7 @@ public:
select_subselect *result,
Item_subselect *item);
int prepare();
void fix_length_and_dec();
void fix_length_and_dec(Item_cache** row);
int exec();
uint cols();
bool depended();

35
sql/sql_class.cc
View File

@ -917,10 +917,10 @@ select_subselect::select_subselect(Item_subselect *item)
this->item=item;
}
bool select_singleval_subselect::send_data(List<Item> &items)
bool select_singlerow_subselect::send_data(List<Item> &items)
{
DBUG_ENTER("select_singleval_subselect::send_data");
Item_singleval_subselect *it= (Item_singleval_subselect *)item;
DBUG_ENTER("select_singlerow_subselect::send_data");
Item_singlerow_subselect *it= (Item_singlerow_subselect *)item;
if (it->assigned())
{
my_message(ER_SUBSELECT_NO_1_ROW, ER(ER_SUBSELECT_NO_1_ROW), MYF(0));
@ -932,32 +932,9 @@ bool select_singleval_subselect::send_data(List<Item> &items)
DBUG_RETURN(0);
}
List_iterator_fast<Item> li(items);
Item *val_item= li++; // Only one (single value subselect)
/*
Following val() call have to be first, because function AVG() & STD()
calculate value on it & determinate "is it NULL?".
*/
it->real_value= val_item->val_result();
if ((it->null_value= val_item->null_value))
{
it->reset();
}
else
{
it->max_length= val_item->max_length;
it->decimals= val_item->decimals;
it->set_charset(val_item->charset());
it->int_value= val_item->val_int_result();
String *s= val_item->str_result(&it->string_value);
if (s != &it->string_value)
{
it->string_value.set(*s, 0, s->length());
}
// TODO: remove when correct charset handling appeared for Item
it->str_value.set(*s, 0, s->length()); // store charset
it->res_type= val_item->result_type();
}
Item *val_item;
for (uint i= 0; (val_item= li++); i++)
it->store(i, val_item);
it->assigned(1);
DBUG_RETURN(0);
}

4
sql/sql_class.h
View File

@ -825,10 +825,10 @@ public:
};
/* Single value subselect interface class */
class select_singleval_subselect :public select_subselect
class select_singlerow_subselect :public select_subselect
{
public:
select_singleval_subselect(Item_subselect *item):select_subselect(item){}
select_singlerow_subselect(Item_subselect *item):select_subselect(item){}
bool send_data(List<Item> &items);
};

12
sql/sql_yacc.yy
View File

@ -587,7 +587,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
simple_ident select_item2 expr opt_expr opt_else sum_expr in_sum_expr
table_wild opt_pad no_in_expr expr_expr simple_expr no_and_expr
using_list expr_or_default set_expr_or_default
param_marker singleval_subselect singleval_subselect_init
param_marker singlerow_subselect singlerow_subselect_init
exists_subselect exists_subselect_init
%type <item_list>
@ -2037,7 +2037,7 @@ simple_expr:
$$= new Item_row(*$5);
}
| EXISTS exists_subselect { $$= $2; }
| singleval_subselect { $$= $1; }
| singlerow_subselect { $$= $1; }
| '{' ident expr '}' { $$= $3; }
| MATCH ident_list_arg AGAINST '(' expr ')'
{ Select->add_ftfunc_to_list((Item_func_match *)
@ -4509,17 +4509,17 @@ union_option:
/* empty */ {}
| ALL {Select->master_unit()->union_option= 1;};
singleval_subselect:
subselect_start singleval_subselect_init
singlerow_subselect:
subselect_start singlerow_subselect_init
subselect_end
{
$$= $2;
};
singleval_subselect_init:
singlerow_subselect_init:
select_init2
{
$$= new Item_singleval_subselect(YYTHD,
$$= new Item_singlerow_subselect(YYTHD,
Lex->current_select->master_unit()->
first_select());
};